SITE INFORMATION AND CORRESPONDENCE_1987-1992

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MLEEDSHILL•HENKENHOFF. INC. To determine if there was a continuing source of PCE/TCE in water conveyed ' by the sewer system, sewer samples were collected from six distinct sewer lines. As with the sewer soil samples, the water samples were collected from the three sewer laterals serving each of the dry-cleaning establish- ments. An attempt was also made to collect a sample of sewage inflow onto Lincoln Village Center from Lincoln Elementary School , which is located just ' north of Lincoln Village Center. This sample could not be obtained because there was essentially no flow from the school at the time of this investiga- tion. Figure 3.3 shows which manholes were sampled. All samples were sealed immediately after being collected, then they were labeled, cooled and transported to the laboratory under appropriate chain- of-custody procedures in accordance with standard EPA protocol . The soil samples were analyzed for purgeable halogenated volatile organics (EPA ' Method No. 8010) and the water samples were analyzed for purgeable halocar- bons (EPA Method' No. 601) . The analytical methods used conform to either EPA Test Methods for Evaluating Solid Wastes (SW-846) , EPA Test Methods for ' Organic Chemical Analysis of Municioal and Industrial Wastewater, or Stan- dard Methods for Examination of Water and Wastewater, and was performed by a certified DOHS hazardous waste analytical laboratory, APPL, Inc. (Certifica- tion No. 126) . A quality assurance-quality control program was undertaken by field person- nel and the laboratory to ensure the highest degree of accuracy and repro- ducibility of the analytical results. To evaluate the potential for outside ' contamination due to field procedures or laboratory contamination, a travel blank was carried during the field work and was transported and analyzed identically to the field samples. To evaluate reproducibility of the results, APPL laboratories analyzed 10% of the samples in duplicate. All sample collection was done under the supervision of a registered civil engineer. A Health and Safety program was enacted before and during the field work portion of this investigation. A pre-sampling safety meeting was held for all on-site personnel which detailed field crew responsibilities, safety and emergency procedures and effects from varying exposure levels of PCE and TCE. Appropriate field gear including Tyvek coveralls, double-lined gloves, booties and half-mask respirators, were on hand for all workers in case TCE/PCE levels became significant. An HNU photo ionization detector was 3-6